This miniature windowless room without gas, electricity or water sits on the edge of the A1 near Stannington in Northumberland.

It doesn't sound like it would be worth more than a look, but is expected to fetch more than &#xA3;10,000 when it is sold in an online auction tomorrow.

A former underground nuclear bunker, the fortress was built in 1961 and used by the Royal Observers Corps (ROC) which was responsible for the recognition and identification of reporting nuclear bursts and monitoring fall-out during the Cold War.

But 30 years later in 1991, with the threat of nuclear attack no longer imminent and the Cold War over, the monitoring room was put out of action and sealed up.

It was later bought by telecomms giant Crown Castle International, but has remained sealed up with all its original contents left inside.

Now people are being given the chance to buy the underground shelter, all its contents and the small patch of land surrounding it.

John Holtby, from chartered surveyors JH Walter, of Lincoln which is managing the sales said the bunker was in reasonably good condition and is confident a lot of people will be putting in offers.

He said: "It is not in bad condition, it is very dry inside and there is no damp. Everything that was there in 1991 when it was closed is still there.

"It is very very difficult to even guess how much it will go for because it really depends on how much interest is generated in the auction.

"We're really not quite sure yet how much people will pay for it, but some have sold in the past for as much as &#xA3;14,000

"It is in a nice setting I suppose, if you like looking at the A1 that is. But around it there are hills and you can look south to Stannington village."

The original furniture includes a table, a shelf, a cupboard, two original folding canvas chairs, one other chair and a stool. There is also a waste bin, a full ashtray, a broom, spade, pick axe, bible, teapot, mirror, cutlery, pots and pans, mattresses and pillows, eight Jerry cans full of petrol, four pairs of Wellington boots, as well as pile of wires, receivers and battery boxes.

The room measures 15ft by 7ft 6in and entrance is through a metal hatch door at the top of the bunker.

There are 12 other underground shelters from around Britain up for sale on ebay and thousands of people are expected to log on to see what they sell for.

Other bunkers are in Warburton and Atherton in Lancashire, Buxton and Hartington in Derbyshire, Hawkshead and Flookburgh in Cumbria Pickering, Dent, Barwick, Lindholme, Rossington in Yorkshire and Louth in Lincolnshire.